BCUpdateXP fails on vanilla XP install (iMac)

I can't get Boot Camp to install on my new iMac 20" (MB323).

1. Installed Boot Camp in OSX, repartitioned to 50GB NTFS.
2. Installed Win/XP w/SP3 from DVD, vanilla install (english).
3. Booted into Win/XP.
4. Inserted the Leopard Install CD.
5. Boot Camp Installer began to run, then got blue screen of death.
(I think this occurred when it got to the Broadcom install.)
5. System autorebooted.

6. Tried to run BCUpdateXP.exe but it doesn't seem to ever come up.

I am stuck!